title: Current fit of medial and lateral unicompartmental knee arthroplasty.
abstract: Whether failure in unicompartmental knee arthroplasty (UKA) is related to implant design remains unclear. We hypothesize that current available UKAs fit within 2 mm. Forty-eight CTs of cadaveric knees were compared to current available UKA brands. Overall no-fit compared to at least one component within 2 mm is high (91.7%) and worse for males (100%) compared to females (833%). Good fit was observed for the medial but not for the lateral tibia plateau. Seven males (29.2%) had larger dimensions of more than 2 mm. For the widest UKA brand, 12 (57%) males and 2 females (8. 3%) had lateral femoral condyles 3 mm larger. Current UKA's in our sample population fit less on the lateral tibia and on femoral condyles.
authors.affiliation: Department of Orthopaedic Surgery, Brigham and Women's Hospital, Boston, Brigham and Women's Arthritis Center, 850 Boylston Street, Chestnut Hill, MA 02467, USA. wfitz@partners.org
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Fitz
authors.forename: Robin
authors.initials: R
authors.lastname: Bliss
authors.forename: Elena
authors.initials: E
authors.lastname: Losina
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000379:methods; D005260:Female; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D017755:Prosthesis Fitting